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3. Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
    December 31, 2014     December 31, 2013     December 31, 2012  
Warrants     726,917       2,489,407       1,934,667  
Convertible preferred stock     1,751,005       1,751,005       1,751,005  
Total possible dilution     2,477,922       4,240,412       3,685,672  
                         
Fair Value Measures
            Input
            Hierarchy
Assets:   2014   2013   Level
   Cash and cash equivalents   $ 123,683   $ 20,343   Level 1
   Certificates of deposit     249,147     246,565   Level 1
   Restricted cash     75,754     75,501   Level 1
      Total   $ 448,584   $ 342,409